A Square has an area of 144 in.² find the length of it’s diagonal

Question

 Need the formula and how to get the answer 

Answer 1

You take the square root of 144 to get the length of the side of the square. That square would have a side length of 12 in.

The formula for the length of the diagonal is to multiply the length of the side by the square root of 2.

The length of the diagonal is 12√2 in.